CBSE Class 8 Science Chapter 6 Combustion and Flame Revision Notes
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When a substance burns in air to give out heat it is called combustion. If it is accompanied by flame it is called burning. A large flame along with heat, light, and smoke constitutes a fire.
Types of combustion
When the combustion takes place in the presence of abundant oxygen such that the combustible substance combines with oxygen to their maximum extent. These reactions have heat and light as visible by-products.
When the combustion takes place in the absence of oxygen such that the substance is unable to burn completely. These reactions leave soot in the container due to the formation of carbon monoxide as a by-product.
A flame is formed by a substance that evaporates on burning. The substance which does not vaporize during burning does not produce the flame. That is why a candle produces a flame while charcoal does not.
Types of flames
The Luminous flame burns yellow; this is because luminous flames have limited access to oxygen. Example:- Candle, kerosene lantern.
Non Luminous flame:
The non-luminous flame burns blue, this is because non-luminous flames have unlimited access to oxygen. Example:- kerosene stove, gas stove.